Question

x^3 + 2x^2 - x - 2 = 0
Срочно.

Answer 1

$x ^{2} (x + 2) - x - 2 = 0 \ x {}^{2}(x + 2) - (x + 2) = 0 \ (x + 2) times (x {}^{2} - 1) = 0 \ x + 2 = 0 \ x {}^{2} - 1 = 0 \ x = + - 1 \ x = - 2$
Ответ: x1=2
x2=1
x3=-1